The raidtab and fstab are not exactly the same as when I did the upgrade, but
very nearly so. The the workaround actually involved commenting out the /dev/md0
line in the fstab, temporarily removing the raidtab, and disconnecting the RAID
disks from their respective controllers. Since I am booting from a SCSI disk,
this worked for me.

It appears to hang during the mount of the file systems. I cannot remember
exactly when the error message came, but it was after I had chosen the upgrade
option and before any files were actually copied to the system disk. There was
enough information in the error window that popped up to give me the idea of
commenting out the /dev/md0 line in fstab -- something about failing temporary
mount of multi-disk device. The message also asked me to save the anaconda dump
and submit the bug report. I assumed it would have all the information about
what was going on at the time. Could the problem be related to the fact that this
is an IDE RAID with a SCSI boot disk? This seems to me to be a fairly unusual
setup.

That I don't know. Once I got the upgrade to happen I was happy. If you want
to experiment with this, it's a Promise Ultra 66 PCI card in addition to the
Tyan S2390A onboard IDE contollers with 4, 75GB IBM DeskStar 75 GXP disks
connected one per IDE channel (80 wire UltraATA cables). The SCSI is a BusLogic
BT-946C controller with one, 18GB IBM DNES-318350W, and an external Toshiba
cdrom.